1 /* 2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 3 * unrestricted use provided that this legend is included on all tape 4 * media and as a part of the software program in whole or part. Users 5 * may copy or modify Sun RPC without charge, but are not authorized 6 * to license or distribute it to anyone else except as part of a product or 7 * program developed by the user. 8 * 9 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 10 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 11 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 12 * 13 * Sun RPC is provided with no support and without any obligation on the 14 * part of Sun Microsystems, Inc. to assist in its use, correction, 15 * modification or enhancement. 16 * 17 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 18 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 19 * OR ANY PART THEREOF. 20 * 21 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 22 * or profits or other special, indirect and consequential damages, even if 23 * Sun has been advised of the possibility of such damages. 24 * 25 * Sun Microsystems, Inc. 26 * 2550 Garcia Avenue 27 * Mountain View, California 94043 28 */ 29 /* 30 * Copyright (c) 1986-1991 by Sun Microsystems Inc. 31 */ 32 33 #ident "@(#)key_call.c 1.25 94/04/24 SMI" 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 /* 39 * key_call.c, Interface to keyserver 40 * 41 * setsecretkey(key) - set your secret key 42 * encryptsessionkey(agent, deskey) - encrypt a session key to talk to agent 43 * decryptsessionkey(agent, deskey) - decrypt ditto 44 * gendeskey(deskey) - generate a secure des key 45 */ 46 47 #include "namespace.h" 48 #include "reentrant.h" 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <unistd.h> 52 #include <errno.h> 53 #include <rpc/rpc.h> 54 #include <rpc/auth.h> 55 #include <rpc/auth_unix.h> 56 #include <rpc/key_prot.h> 57 #include <string.h> 58 #include <netconfig.h> 59 #include <sys/utsname.h> 60 #include <stdlib.h> 61 #include <signal.h> 62 #include <sys/wait.h> 63 #include <sys/fcntl.h> 64 #include "un-namespace.h" 65 66 67 #define KEY_TIMEOUT 5 /* per-try timeout in seconds */ 68 #define KEY_NRETRY 12 /* number of retries */ 69 70 #ifdef DEBUG 71 #define debug(msg) (void) fprintf(stderr, "%s\n", msg); 72 #else 73 #define debug(msg) 74 #endif /* DEBUG */ 75 76 /* 77 * Hack to allow the keyserver to use AUTH_DES (for authenticated 78 * NIS+ calls, for example). The only functions that get called 79 * are key_encryptsession_pk, key_decryptsession_pk, and key_gendes. 80 * 81 * The approach is to have the keyserver fill in pointers to local 82 * implementations of these functions, and to call those in key_call(). 83 */ 84 85 cryptkeyres *(*__key_encryptsession_pk_LOCAL)() = 0; 86 cryptkeyres *(*__key_decryptsession_pk_LOCAL)() = 0; 87 des_block *(*__key_gendes_LOCAL)() = 0; 88 89 static int key_call( u_long, xdrproc_t, char *, xdrproc_t, char * ); 90 91 int 92 key_setsecret(secretkey) 93 const char *secretkey; 94 { 95 keystatus status; 96 97 if (!key_call((u_long) KEY_SET, xdr_keybuf, (char *) secretkey, 98 xdr_keystatus, (char *)&status)) { 99 return (-1); 100 } 101 if (status != KEY_SUCCESS) { 102 debug("set status is nonzero"); 103 return (-1); 104 } 105 return (0); 106 } 107 108 109 /* key_secretkey_is_set() returns 1 if the keyserver has a secret key 110 * stored for the caller's effective uid; it returns 0 otherwise 111 * 112 * N.B.: The KEY_NET_GET key call is undocumented. Applications shouldn't 113 * be using it, because it allows them to get the user's secret key. 114 */ 115 116 int 117 key_secretkey_is_set(void) 118 { 119 struct key_netstres kres; 120 121 memset((void*)&kres, 0, sizeof (kres)); 122 if (key_call((u_long) KEY_NET_GET, xdr_void, (char *)NULL, 123 xdr_key_netstres, (char *) &kres) && 124 (kres.status == KEY_SUCCESS) && 125 (kres.key_netstres_u.knet.st_priv_key[0] != 0)) { 126 /* avoid leaving secret key in memory */ 127 memset(kres.key_netstres_u.knet.st_priv_key, 0, HEXKEYBYTES); 128 return (1); 129 } 130 return (0); 131 } 132 133 int 134 key_encryptsession_pk(remotename, remotekey, deskey) 135 char *remotename; 136 netobj *remotekey; 137 des_block *deskey; 138 { 139 cryptkeyarg2 arg; 140 cryptkeyres res; 141 142 arg.remotename = remotename; 143 arg.remotekey = *remotekey; 144 arg.deskey = *deskey; 145 if (!key_call((u_long)KEY_ENCRYPT_PK, xdr_cryptkeyarg2, (char *)&arg, 146 xdr_cryptkeyres, (char *)&res)) { 147 return (-1); 148 } 149 if (res.status != KEY_SUCCESS) { 150 debug("encrypt status is nonzero"); 151 return (-1); 152 } 153 *deskey = res.cryptkeyres_u.deskey; 154 return (0); 155 } 156 157 int 158 key_decryptsession_pk(remotename, remotekey, deskey) 159 char *remotename; 160 netobj *remotekey; 161 des_block *deskey; 162 { 163 cryptkeyarg2 arg; 164 cryptkeyres res; 165 166 arg.remotename = remotename; 167 arg.remotekey = *remotekey; 168 arg.deskey = *deskey; 169 if (!key_call((u_long)KEY_DECRYPT_PK, xdr_cryptkeyarg2, (char *)&arg, 170 xdr_cryptkeyres, (char *)&res)) { 171 return (-1); 172 } 173 if (res.status != KEY_SUCCESS) { 174 debug("decrypt status is nonzero"); 175 return (-1); 176 } 177 *deskey = res.cryptkeyres_u.deskey; 178 return (0); 179 } 180 181 int 182 key_encryptsession(remotename, deskey) 183 const char *remotename; 184 des_block *deskey; 185 { 186 cryptkeyarg arg; 187 cryptkeyres res; 188 189 arg.remotename = (char *) remotename; 190 arg.deskey = *deskey; 191 if (!key_call((u_long)KEY_ENCRYPT, xdr_cryptkeyarg, (char *)&arg, 192 xdr_cryptkeyres, (char *)&res)) { 193 return (-1); 194 } 195 if (res.status != KEY_SUCCESS) { 196 debug("encrypt status is nonzero"); 197 return (-1); 198 } 199 *deskey = res.cryptkeyres_u.deskey; 200 return (0); 201 } 202 203 int 204 key_decryptsession(remotename, deskey) 205 const char *remotename; 206 des_block *deskey; 207 { 208 cryptkeyarg arg; 209 cryptkeyres res; 210 211 arg.remotename = (char *) remotename; 212 arg.deskey = *deskey; 213 if (!key_call((u_long)KEY_DECRYPT, xdr_cryptkeyarg, (char *)&arg, 214 xdr_cryptkeyres, (char *)&res)) { 215 return (-1); 216 } 217 if (res.status != KEY_SUCCESS) { 218 debug("decrypt status is nonzero"); 219 return (-1); 220 } 221 *deskey = res.cryptkeyres_u.deskey; 222 return (0); 223 } 224 225 int 226 key_gendes(key) 227 des_block *key; 228 { 229 if (!key_call((u_long)KEY_GEN, xdr_void, (char *)NULL, 230 xdr_des_block, (char *)key)) { 231 return (-1); 232 } 233 return (0); 234 } 235 236 int 237 key_setnet(arg) 238 struct key_netstarg *arg; 239 { 240 keystatus status; 241 242 243 if (!key_call((u_long) KEY_NET_PUT, xdr_key_netstarg, (char *) arg, 244 xdr_keystatus, (char *) &status)){ 245 return (-1); 246 } 247 248 if (status != KEY_SUCCESS) { 249 debug("key_setnet status is nonzero"); 250 return (-1); 251 } 252 return (1); 253 } 254 255 256 int 257 key_get_conv(pkey, deskey) 258 char *pkey; 259 des_block *deskey; 260 { 261 cryptkeyres res; 262 263 if (!key_call((u_long) KEY_GET_CONV, xdr_keybuf, pkey, 264 xdr_cryptkeyres, (char *)&res)) { 265 return (-1); 266 } 267 if (res.status != KEY_SUCCESS) { 268 debug("get_conv status is nonzero"); 269 return (-1); 270 } 271 *deskey = res.cryptkeyres_u.deskey; 272 return (0); 273 } 274 275 struct key_call_private { 276 CLIENT *client; /* Client handle */ 277 pid_t pid; /* process-id at moment of creation */ 278 uid_t uid; /* user-id at last authorization */ 279 }; 280 static struct key_call_private *key_call_private_main = NULL; 281 282 static void 283 key_call_destroy(void *vp) 284 { 285 struct key_call_private *kcp = (struct key_call_private *)vp; 286 287 if (kcp) { 288 if (kcp->client) 289 clnt_destroy(kcp->client); 290 free(kcp); 291 } 292 } 293 294 /* 295 * Keep the handle cached. This call may be made quite often. 296 */ 297 static CLIENT * 298 getkeyserv_handle(vers) 299 int vers; 300 { 301 void *localhandle; 302 struct netconfig *nconf; 303 struct netconfig *tpconf; 304 struct key_call_private *kcp = key_call_private_main; 305 struct timeval wait_time; 306 struct utsname u; 307 int main_thread; 308 int fd; 309 static thread_key_t key_call_key; 310 extern mutex_t tsd_lock; 311 312 #define TOTAL_TIMEOUT 30 /* total timeout talking to keyserver */ 313 #define TOTAL_TRIES 5 /* Number of tries */ 314 315 if ((main_thread = thr_main())) { 316 kcp = key_call_private_main; 317 } else { 318 if (key_call_key == 0) { 319 mutex_lock(&tsd_lock); 320 if (key_call_key == 0) 321 thr_keycreate(&key_call_key, key_call_destroy); 322 mutex_unlock(&tsd_lock); 323 } 324 kcp = (struct key_call_private *)thr_getspecific(key_call_key); 325 } 326 if (kcp == (struct key_call_private *)NULL) { 327 kcp = (struct key_call_private *)malloc(sizeof (*kcp)); 328 if (kcp == (struct key_call_private *)NULL) { 329 return ((CLIENT *) NULL); 330 } 331 if (main_thread) 332 key_call_private_main = kcp; 333 else 334 thr_setspecific(key_call_key, (void *) kcp); 335 kcp->client = NULL; 336 } 337 338 /* if pid has changed, destroy client and rebuild */ 339 if (kcp->client != NULL && kcp->pid != getpid()) { 340 clnt_destroy(kcp->client); 341 kcp->client = NULL; 342 } 343 344 if (kcp->client != NULL) { 345 /* if uid has changed, build client handle again */ 346 if (kcp->uid != geteuid()) { 347 kcp->uid = geteuid(); 348 auth_destroy(kcp->client->cl_auth); 349 kcp->client->cl_auth = 350 authsys_create("", kcp->uid, 0, 0, NULL); 351 if (kcp->client->cl_auth == NULL) { 352 clnt_destroy(kcp->client); 353 kcp->client = NULL; 354 return ((CLIENT *) NULL); 355 } 356 } 357 /* Change the version number to the new one */ 358 clnt_control(kcp->client, CLSET_VERS, (void *)&vers); 359 return (kcp->client); 360 } 361 if (!(localhandle = setnetconfig())) { 362 return ((CLIENT *) NULL); 363 } 364 tpconf = NULL; 365 #if defined(__FreeBSD__) 366 if (uname(&u) == -1) 367 #else 368 #if defined(i386) 369 if (_nuname(&u) == -1) 370 #elif defined(sparc) 371 if (_uname(&u) == -1) 372 #else 373 #error Unknown architecture! 374 #endif 375 #endif 376 { 377 endnetconfig(localhandle); 378 return ((CLIENT *) NULL); 379 } 380 while ((nconf = getnetconfig(localhandle)) != NULL) { 381 if (strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) { 382 /* 383 * We use COTS_ORD here so that the caller can 384 * find out immediately if the server is dead. 385 */ 386 if (nconf->nc_semantics == NC_TPI_COTS_ORD) { 387 kcp->client = clnt_tp_create(u.nodename, 388 KEY_PROG, vers, nconf); 389 if (kcp->client) 390 break; 391 } else { 392 tpconf = nconf; 393 } 394 } 395 } 396 if ((kcp->client == (CLIENT *) NULL) && (tpconf)) 397 /* Now, try the CLTS or COTS loopback transport */ 398 kcp->client = clnt_tp_create(u.nodename, 399 KEY_PROG, vers, tpconf); 400 endnetconfig(localhandle); 401 402 if (kcp->client == (CLIENT *) NULL) { 403 return ((CLIENT *) NULL); 404 } 405 kcp->uid = geteuid(); 406 kcp->pid = getpid(); 407 kcp->client->cl_auth = authsys_create("", kcp->uid, 0, 0, NULL); 408 if (kcp->client->cl_auth == NULL) { 409 clnt_destroy(kcp->client); 410 kcp->client = NULL; 411 return ((CLIENT *) NULL); 412 } 413 414 wait_time.tv_sec = TOTAL_TIMEOUT/TOTAL_TRIES; 415 wait_time.tv_usec = 0; 416 (void) clnt_control(kcp->client, CLSET_RETRY_TIMEOUT, 417 (char *)&wait_time); 418 if (clnt_control(kcp->client, CLGET_FD, (char *)&fd)) 419 _fcntl(fd, F_SETFD, 1); /* make it "close on exec" */ 420 421 return (kcp->client); 422 } 423 424 /* returns 0 on failure, 1 on success */ 425 426 static int 427 key_call(proc, xdr_arg, arg, xdr_rslt, rslt) 428 u_long proc; 429 xdrproc_t xdr_arg; 430 char *arg; 431 xdrproc_t xdr_rslt; 432 char *rslt; 433 { 434 CLIENT *clnt; 435 struct timeval wait_time; 436 437 if (proc == KEY_ENCRYPT_PK && __key_encryptsession_pk_LOCAL) { 438 cryptkeyres *res; 439 res = (*__key_encryptsession_pk_LOCAL)(geteuid(), arg); 440 *(cryptkeyres*)rslt = *res; 441 return (1); 442 } else if (proc == KEY_DECRYPT_PK && __key_decryptsession_pk_LOCAL) { 443 cryptkeyres *res; 444 res = (*__key_decryptsession_pk_LOCAL)(geteuid(), arg); 445 *(cryptkeyres*)rslt = *res; 446 return (1); 447 } else if (proc == KEY_GEN && __key_gendes_LOCAL) { 448 des_block *res; 449 res = (*__key_gendes_LOCAL)(geteuid(), 0); 450 *(des_block*)rslt = *res; 451 return (1); 452 } 453 454 if ((proc == KEY_ENCRYPT_PK) || (proc == KEY_DECRYPT_PK) || 455 (proc == KEY_NET_GET) || (proc == KEY_NET_PUT) || 456 (proc == KEY_GET_CONV)) 457 clnt = getkeyserv_handle(2); /* talk to version 2 */ 458 else 459 clnt = getkeyserv_handle(1); /* talk to version 1 */ 460 461 if (clnt == NULL) { 462 return (0); 463 } 464 465 wait_time.tv_sec = TOTAL_TIMEOUT; 466 wait_time.tv_usec = 0; 467 468 if (clnt_call(clnt, proc, xdr_arg, arg, xdr_rslt, rslt, 469 wait_time) == RPC_SUCCESS) { 470 return (1); 471 } else { 472 return (0); 473 } 474 } 475